Tenshi, Ei-chan, and Shiratori all attend Kawagoe Academy. One day, they get pulled into the orbit of former conductor Haruo. He drags them into his newly founded boys choir where they suddenly find themselves performing a song in front of an audience!

Once you go, hey, look! 
A sky that's all too blue
!بعدما تمضي، انظر
سماء بغاية الزُرقة
Regarde le ciel
Il se teinte déjà de bleu
Una volta partiti, guarda!
 Il cielo è sempre più azzurro.
Basta ir em frente que
o céu azul se mostra
А когда добежишь — смотри! 
Над тобой синее небо.